Fix UTXO diff child error

[michaelsutton]

This PR fixes a bug which randomly occurred and indicated a corruption in virtual's state

[codecov]

Codecov Report

Merging #2084 (661033b) into dev (b2648aa) will increase coverage by 0.00%.
The diff coverage is 70.37%.

❗ Current head 661033b differs from pull request most recent head 9901926. Consider uploading reports for the commit 9901926 to get more accurate results

@@           Coverage Diff           @@
##              dev    #2084   +/-   ##
=======================================
  Coverage   59.30%   59.30%           
=======================================
  Files         678      678           
  Lines       32625    32617    -8     
=======================================
- Hits        19347    19343    -4     
+ Misses      10481    10480    -1     
+ Partials     2797     2794    -3     

Impacted Files	Coverage Δ
...cesses/blockprocessor/validate_and_insert_block.go	69.76% <0.00%> (-0.33%)	⬇️
...nsensus/processes/consensusstatemanager/resolve.go	57.69% <0.00%> (+3.14%)	⬆️
...cesses/consensusstatemanager/reverse_utxo_diffs.go	64.44% <ø> (ø)
domain/migrate.go	0.00% <0.00%> (ø)
...nsensus/processes/pruningmanager/pruningmanager.go	52.45% <50.00%> (-0.46%)	⬇️
domain/consensus/consensus.go	67.77% <75.86%> (+0.48%)	⬆️
app/protocol/flowcontext/blocks.go	68.67% <100.00%> (ø)
app/protocol/flowcontext/orphans.go	67.54% <100.00%> (ø)
.../protocol/flows/v5/blockrelay/handle_relay_invs.go	53.44% <100.00%> (-0.41%)	⬇️
app/protocol/flows/v5/blockrelay/ibd.go	46.06% <100.00%> (ø)
... and 11 more

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