fix bug of wasm pgu

[yann-sjtu]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• Reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #3097 (c7308fc) into dev (9fb2deb) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head c7308fc differs from pull request most recent head 3dfe15b. Consider uploading reports for the commit 3dfe15b to get more accurate results

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@@            Coverage Diff             @@
##              dev    #3097      +/-   ##
==========================================
- Coverage   35.91%   35.90%   -0.01%     
==========================================
  Files         434      434              
  Lines       45779    45779              
==========================================
- Hits        16441    16439       -2     
- Misses      28149    28150       +1     
- Partials     1189     1190       +1     

see 1 file with indirect coverage changes

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