[stable5.1] fix: free busy not updating date

[backportbot]

Backport of PR #6690

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 14.54%. Comparing base (0e7fa88) to head (6f3984d).
Report is 10 commits behind head on stable5.1.

Files with missing lines	Patch %	Lines
src/store/calendarObjectInstance.js	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           stable5.1    #6691   +/-   ##
==========================================
  Coverage      14.53%   14.54%           
==========================================
  Files            210      210           
  Lines           9822     9820    -2     
  Branches        2310     2311    +1     
==========================================
  Hits            1428     1428           
+ Misses          8067     8066    -1     
+ Partials         327      326    -1     

Flag	Coverage Δ
javascript	14.54% <0.00%> (+<0.01%)	⬆️

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