Fixed bug with extras registration

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10% :tada:

Comparison is base (f74ad78) 93.13% compared to head (3733555) 93.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== + Coverage 93.13% 93.23% +0.10% ========================================== Files 30 30 Lines 4269 4275 +6 Branches 420 421 +1 ========================================== + Hits 3976 3986 +10 + Misses 225 221 -4 Partials 68 68 ``` | [Files Changed](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework) | Coverage Δ | | |---|---|---| | [fileformats/core/fileset.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9maWxlc2V0LnB5) | `85.71% <100.00%> (ø)` | | | [fileformats/core/mark.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9tYXJrLnB5) | `77.94% <100.00%> (+6.72%)` | :arrow_up: | | [fileformats/core/utils.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS91dGlscy5weQ==) | `78.62% <100.00%> (+0.60%)` | :arrow_up: |

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