Fish of any type refuse to get in the buckets. Salmon, tropical, cod, etc. One in 200+ tries will get a fish in a bucket but has a habit of disappearing when in the bucket.
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Cannot reproduce on Windows 10. Did you press your left trigger twice while collecting the fish? Using your left trigger after the fish has been caught will release the fish from the bucket.

I find that the controls are overly sensitive when using buckets, especially when underwater. It is easy to fill and empty a bucket rapidly by mistake when trying to collect fish. Therefore I am confirming this report.
I suspect the problem is that when there are multiple water source blocks next to each other, the game allows you to interact with one after another continuously, like when planting crops. Or, more generally, buckets can be used continuously. This is nice in creative mode when you want to fill an area with many water sources using a water bucket, but it can be really annoying in survival when trying to catch fish or work with water while underwater.

Does MCPE-44320 describe the issue?
Are you on iOS or android because I couldn’t put em in a bucket I found out u need to hold ur finger on the fish with a bucket in ur hand