Some Jupyter notebook comments disappear on commits

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Steps to reproduce

• upload Jupyter notebook with plot
• update plot without changing the code (e.g. random data or external input file)
• comment below the plot on the commit
• refresh page

What is the current bug behavior?

comment disappears, compare for example

• no comment on commit: winniehell/test@e503c2e8
• comment on corresponding merge request: winniehell/test!7 (comment 1365330969)
• comment part of API response: https://gitlab.com/api/v4/projects/winniehell%2Ftest/repository/commits/e503c2e85c0dc73bb07e29b8205c040ae0618fb0/comments

What is the expected correct behavior?

comment is displayed