Image locks up when trying to checkout branch using IceBerg

[belaroesener]

Problem

When I try to check out a branch from my fork of the pharo code base, the image locks up in a way that I can't even interrupt.

Reproduction

1. Create fresh Pharo 14 Image
2. Connect pharo repo to fresh clone of belaroesener/pharo using IceBerg
3. "Repair Repository" > "Create new branch pointing to image commit"
4. (Shows uncommitted changes for *Deprecated13, *Deprecated14 and *Morphic-Deprecated. But committing does not show any differences)
5. "Checkout branch origin/add-reset-to-defaults-button-to-setting-browser" > "Checkout packages already loaded in the image"
6. Image locks up, 100% CPU usage, ~1.5GB RAM usage
7. 

I can not interrupt the execution using CMD-.
After around 40 minutes the RAM usage has risen to ~1.8GB, otherwise no changes.

If instead, I check out the commit 538a19b (2025-11-11 20:35), which is the base of my branch, I get the same behaviour