I have reverted the following two commits from both Eoan 5.3.0-53 and Focal 5.4.0-31 and I was not able to reproduce the problem anymore:
Revert "UBUNTU: SAUCE: overlayfs: use shiftfs hacks only with shiftfs as underlay" Revert "UBUNTU: SAUCE: overlayfs: fix shitfs special-casing"
I have reverted the following two commits from both Eoan 5.3.0-53 and Focal 5.4.0-31 and I was not able to reproduce the problem anymore:
Revert "UBUNTU: SAUCE: overlayfs: use shiftfs hacks only with shiftfs as underlay"
Revert "UBUNTU: SAUCE: overlayfs: fix shitfs special-casing"