Is anyone still have problems with Flex Pitch in Logic Pro X in 2024 ?

is anyone aware of any bugfixes in the works?

No, this is only a user forum. There is and never was any statement of a developer or from Apple except from Mods or community specialists... There are other Logic forum's that claim to have contact with developers.

Has anyone found any workarounds

These are my personal solutions or ways to get used to it:

1. Precondition: Every "mode change" (change of flex algorithm), e.g. from flex pitch to monophonic, every change of quantization grid format, destroys all the steps you have done manually up to that point. This is indeed quite annoying.

I usually bounce (in place) the steps I've done so far, regardless of whether it's Flex Pitch or laboriously manually edited quantizations (usually by Slicing, but it depends on the material). What I've never tried is the command "Apply Quantization Permanently" which works perfectly with midi.... I / we need to try and reseach it!

2. Workflow to avoid or decrease artefacts ("pops, cuts outs, and clicks, YIKES"):

I edit the quantized tracks manually, mostly by simply deleting or less often by moving flex markers. However, it is important to bounce the edit before changing the quantization grid values or flex algorithms.