I used the attached script for finding affected packages which found the following symlink - not symlink mismatches in Bionic main:
Mismatching doc(s) in files: ./pool/main/g/gpm/libgpm-dev_1.20.7-5_i386.deb ./pool/main/g/gpm/libgpm-dev_1.20.7-5_amd64.deb ./usr/share/doc/libgpm-dev/changelog.Debian.gz 3295 0
Mismatching doc(s) in files: ./pool/main/l/linux/linux-modules-extra-4.15.0-20-generic_4.15.0-20.21_i386.deb ./pool/main/l/linux/linux-modules-extra-4.15.0-20-generic_4.15.0-20.21_amd64.deb ./usr/share/doc/linux-modules-extra-4.15.0-20-generic/changelog.Debian.gz 0 55079
Mismatching doc(s) in files: ./pool/main/l/linux/linux-modules-extra-4.15.0-22-generic_4.15.0-22.24_i386.deb ./pool/main/l/linux/linux-modules-extra-4.15.0-22-generic_4.15.0-22.24_amd64.deb ./usr/share/doc/linux-modules-extra-4.15.0-22-generic/changelog.Debian.gz 0 41296
Mismatching doc(s) in files: ./pool/main/l/linux/linux-modules-extra-4.15.0-23-generic_4.15.0-23.25_i386.deb ./pool/main/l/linux/linux-modules-extra-4.15.0-23-generic_4.15.0-23.25_amd64.deb ./usr/share/doc/linux-modules-extra-4.15.0-23-generic/changelog.Debian.gz 0 34363
Mismatching doc(s) in files: ./pool/main/l/linux/linux-modules-extra-4.15.0-24-generic_4.15.0-24.26_i386.deb ./pool/main/l/linux/linux-modules-extra-4.15.0-24-generic_4.15.0-24.26_amd64.deb ./usr/share/doc/linux-modules-extra-4.15.0-24-generic/changelog.Debian.gz 0 37489
Mismatching doc(s) in files: ./pool/main/l/linux/linux-modules-extra-4.15.0-28-generic_4.15.0-28.30_i386.deb ./pool/main/l/linux/linux-modules-extra-4.15.0-28-generic_4.15.0-28.30_amd64.deb ./usr/share/doc/linux-modules-extra-4.15.0-28-generic/changelog.Debian.gz 0 25563
Mismatching doc(s) in files: ./pool/main/o/openipmi/libopenipmi-dev_2.0.22-1.1ubuntu2_i386.deb ./pool/main/o/openipmi/libopenipmi-dev_2.0.22-1.1ubuntu2_amd64.deb ./usr/share/doc/libopenipmi-dev/changelog.Debian.gz 1902 0
Mismatching doc(s) in files: ./pool/main/p/perl/libperl5.26_5.26.1-6ubuntu0.1_i386.deb ./pool/main/p/perl/libperl5.26_5.26.1-6ubuntu0.1_amd64.deb ./usr/share/doc/libperl5.26/changelog.Debian.gz 0 1859
From those the linux packages and perl seems to be caused by this particular bug, the others are caused by LP: #1782094.
Linux packages are less interesting from multiarch perspective and they are updated frequently thus rebuilding them is not necessary.
I suggest rebuilding perl with the fixed pkgbinarymangler.
I used the attached script for finding affected packages which found the following symlink - not symlink mismatches in Bionic main: main/g/ gpm/libgpm- dev_1.20. 7-5_i386. deb ./pool/ main/g/ gpm/libgpm- dev_1.20. 7-5_amd64. deb ./usr/share/ doc/libgpm- dev/changelog. Debian. gz 3295 0 main/l/ linux/linux- modules- extra-4. 15.0-20- generic_ 4.15.0- 20.21_i386. deb ./pool/ main/l/ linux/linux- modules- extra-4. 15.0-20- generic_ 4.15.0- 20.21_amd64. deb ./usr/share/ doc/linux- modules- extra-4. 15.0-20- generic/ changelog. Debian. gz 0 55079 main/l/ linux/linux- modules- extra-4. 15.0-22- generic_ 4.15.0- 22.24_i386. deb ./pool/ main/l/ linux/linux- modules- extra-4. 15.0-22- generic_ 4.15.0- 22.24_amd64. deb ./usr/share/ doc/linux- modules- extra-4. 15.0-22- generic/ changelog. Debian. gz 0 41296 main/l/ linux/linux- modules- extra-4. 15.0-23- generic_ 4.15.0- 23.25_i386. deb ./pool/ main/l/ linux/linux- modules- extra-4. 15.0-23- generic_ 4.15.0- 23.25_amd64. deb ./usr/share/ doc/linux- modules- extra-4. 15.0-23- generic/ changelog. Debian. gz 0 34363 main/l/ linux/linux- modules- extra-4. 15.0-24- generic_ 4.15.0- 24.26_i386. deb ./pool/ main/l/ linux/linux- modules- extra-4. 15.0-24- generic_ 4.15.0- 24.26_amd64. deb ./usr/share/ doc/linux- modules- extra-4. 15.0-24- generic/ changelog. Debian. gz 0 37489 main/l/ linux/linux- modules- extra-4. 15.0-28- generic_ 4.15.0- 28.30_i386. deb ./pool/ main/l/ linux/linux- modules- extra-4. 15.0-28- generic_ 4.15.0- 28.30_amd64. deb ./usr/share/ doc/linux- modules- extra-4. 15.0-28- generic/ changelog. Debian. gz 0 25563 main/o/ openipmi/ libopenipmi- dev_2.0. 22-1.1ubuntu2_ i386.deb ./pool/ main/o/ openipmi/ libopenipmi- dev_2.0. 22-1.1ubuntu2_ amd64.deb ./usr/share/ doc/libopenipmi -dev/changelog. Debian. gz 1902 0 main/p/ perl/libperl5. 26_5.26. 1-6ubuntu0. 1_i386. deb ./pool/ main/p/ perl/libperl5. 26_5.26. 1-6ubuntu0. 1_amd64. deb ./usr/share/ doc/libperl5. 26/changelog. Debian. gz 0 1859
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
Mismatching doc(s) in files: ./pool/
From those the linux packages and perl seems to be caused by this particular bug, the others are caused by LP: #1782094.
Linux packages are less interesting from multiarch perspective and they are updated frequently thus rebuilding them is not necessary.
I suggest rebuilding perl with the fixed pkgbinarymangler.