It just works™ (and more)

Block Swap successor.
It's easy to use and it just works with no issues.

I only needed to swap some blocks which it does perfectly, but it can also do a lot more such as NBT filtering, namespace filtering, context awareness like for example replace blocks in a specific biome or structure, and a lot more.

I only listed a few features that stood out to me since I don't wanna just paste the whole list here, but everything is listed on the documentation page which I recommend checking out if you wanna go more in depth.
https://moddedmc.wiki/en/project/reliable-replacer/latest/docs/reliable-replacer/features