fix(BUX-250): BUMP-related fixes found during testing

[arkadiuszos4chain]

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[codecov]

Codecov Report

Merging #466 (153ddd2) into feat-291-change-broadcast-rc (e618fcb) will decrease coverage by 0.74%.
Report is 1 commits behind head on feat-291-change-broadcast-rc.
The diff coverage is 70.67%.

Additional details and impacted files

@@                       Coverage Diff                        @@
##           feat-291-change-broadcast-rc     #466      +/-   ##
================================================================
- Coverage                         53.13%   52.40%   -0.74%     
================================================================
  Files                               106      106              
  Lines                             11056    11174     +118     
================================================================
- Hits                               5875     5856      -19     
- Misses                             4713     4849     +136     
- Partials                            468      469       +1     

Flag	Coverage Δ
unittests	52.40% <70.67%> (-0.74%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
model_transactions.go	77.89% <100.00%> (-0.12%)	⬇️
db_model_transactions.go	58.78% <0.00%> (+0.35%)	⬆️
model_merkle_proof.go	85.18% <82.35%> (-2.49%)	⬇️
model_draft_transactions.go	72.62% <55.55%> (-0.22%)	⬇️
model_bump.go	69.43% <70.47%> (-6.63%)	⬇️

... and 3 files with indirect coverage changes

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[arkadiuszos4chain]

Approved by me in previous PR :D