[stable3.0] Fix: Inconsistencies due to ALTREP parameter

[backportbot-nextcloud]

backport of #3918

[codecov]

Codecov Report

Merging #3920 (88645fd) into stable3.0 (fcde103) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##             stable3.0    #3920      +/-   ##
===============================================
- Coverage        29.69%   29.67%   -0.02%     
  Complexity         318      318              
===============================================
  Files              219      219              
  Lines             7372     7376       +4     
  Branches           910      912       +2     
===============================================
  Hits              2189     2189              
- Misses            5183     5187       +4     

Flag	Coverage Δ
javascript	20.80% <0.00%> (-0.02%)	⬇️
php	68.16% <ø> (ø)

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Impacted Files	Coverage Δ
src/store/calendarObjectInstance.js	0.00% <0.00%> (ø)

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[st3iny]

Tested and works.