It depends on what you bitflip.

I once had a bitflip pattern causing lowercase ascii to turn into uppercase ascii in a case insensitive system. Everything was fine until it tried to uppercase numbers and things went wrong

The first time I had to deal with faulty ram ( more than 20y ago ), the bug would never trigger unless I used pretty much the whole dimm stick and put meaningful stuff in it etc in my case linking large executables , or untargzipping large source archives.

Flipping a pixel had no impact though