Your following logs show that shim-signed 1.34.7+13-0ubuntu2 was pulled in by curtin.
However, we've also identified that LP: #1766627 affects this version of shim-signed, so that's probably what you were originally experiencing and is definitely what you are seeing now.
A final fix for this bug is in progress; shim-signed 1.34.9 is expected to completely resolve this issue, and will land in the next round of image builds.
Your following logs show that shim-signed 1.34.7+13-0ubuntu2 was pulled in by curtin.
However, we've also identified that LP: #1766627 affects this version of shim-signed, so that's probably what you were originally experiencing and is definitely what you are seeing now.
A final fix for this bug is in progress; shim-signed 1.34.9 is expected to completely resolve this issue, and will land in the next round of image builds.