It seems like you are experiencing an issue with random keyframes appearing every 45 frames in a PNG sequence export. This could be related to a known bug where the FPS settings for sequence keys and the timeline FPS are the same, causing frame skipping or unexpected behavior. A workaround for this issue is to slightly adjust the FPS settings, such as setting the sequence key FPS to 59 if your timeline FPS is 60, to see if this resolves the problem. Additionally, ensure that your export settings are correctly configured and that no other software is interfering with the export process.
If the problem persists, it might be helpful to check if there are any specific settings or configurations in your project that could be causing this behavior. You can also try exporting with different settings or on a different machine to rule out any environment-specific issues.
