When the TrashSlot mod is installed and a recipe is viewed specifically within Creative mode, the game crashes and returns the following:

java.lang.IndexOutOfBoundsException: Index: 45, Size: 45
at java.util.ArrayList.rangeCheck(ArrayList.java:659)
at java.util.ArrayList.get(ArrayList.java:435)...

This crash is very similar to the one visible here: #388
To reiterate, this crash does not happen when checking a recipe during Survival, and I have singled out TrashSlot as the only mod that causes this error.
I made sure to update the mod since I saw this: GTNewHorizons/Hodgepodge#219 - but the case is still the same.

The 3 lines of log you provide don't help at all, pos the full crash log for proper support

I have the same issue. Attached is my version of the crash report using my own modpack. The source is definitely this mod and I am able to reproduce the issue.

https://pastebin.com/iuh1rGyV

Cannot reproduce with simple NEI + TrashSlot env, so another mod should be involved in this issue.