Fix how masp tx's are identified

[batconjurer]

Describe your changes

Resolves issue #2684

Indicate on which release or other PRs this topic is based on

Checklist before merging to draft

• [x] I have added a changelog
• [x] Git history is in acceptable state

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.40%. Comparing base (97ec5b4) to head (f43e333). Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2790   +/-   ##
=======================================
  Coverage   59.39%   59.40%           
=======================================
  Files         298      298           
  Lines       92771    92770    -1     
=======================================
+ Hits        55104    55106    +2     
+ Misses      37667    37664    -3     

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