Automatic image conversion to HEIF breaks Gallery on Safari

This is a known issue. A fix is set to be included in release 6.7.1:

Targeted Fixes

[…]

The following are bugs that should be included if ready, but as understood now are not affecting as many people or are less problematic:

  • […]
  • Using the Upload button in image-based blocks in Safari unexpectedly converts images to HEIC with a temporary file name (#62447)

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