fix tempname usage

[t-bltg]

Fix #5020.

Backport #5006.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.75%. Comparing base (fa65e7d) to head (f97e058).
Report is 31 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5023      +/-   ##
==========================================
- Coverage   89.77%   89.75%   -0.02%     
==========================================
  Files          40       40              
  Lines        8780     8817      +37     
==========================================
+ Hits         7882     7914      +32     
- Misses        898      903       +5     

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