Editing 4K clip on 1080 sequence in Source Monitor uses incorrect crop
When double-clicking a 4K clip instance from a 1080 sequence to load it into the Source Monitor (SM), the SM displays the clip as cropped instead of fitting it to view. It doesn't exhibit this behavior if the same clip is loaded into the SM from the Project window, or if the 'Scale to Frame Size' is set for the master clip, even if that setting is overridden (turned off) in the timeline instance of the clip. Full details including a screencast of the issue can be found here:

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THCreat commented
This is really frustrating. Any ideas on a decent workaround? The crop means it's next to impossible to adjust what part of a 4k clip is being shown in the main 1080p project once you've set that. Is there another way I could be doing that?
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Anna Skillom commented
Almost 3 years later and still the same issue? Please Adobe fix this.
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Deverge Admin commented
Please fix this!! In addition to the link in this description, here's yet another Adobe forum post where users are frustrated with this issue, and I think it more clearly explains the problem: https://community.adobe.com/t5/premiere-pro-discussions/cropped-footage-frame-in-source-monitor/m-p/12853570#M403279
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Joseph Morton commented
so frustrating. With 4k+ footage on 1080p timelines, the source should show the SOURCE, not randomly crop it. Its not "Cropping" the footage in the program, so why would the source footage now be cropped? This is where I apply looks, other motion effects, etc, so I need to see the whole frame that the program is seeing. Or am I completely off base on how you edit?
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JK commented
Please fix this. Its unusable as is.
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Fabio Silva commented
Yes please! Same thing when editing 8k footage in a 4K timeline, the Source monitor is cropped.... kinda sucks.
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Andreas Urra commented
Any news here? This is a clear bug. Double clicking a clip on the Timeline is such an essential part of any editing workflow.
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Andreas Urra commented
In addition to the Source Monitor this also happens in the Multicam view (4k Multicam sequence in a 1080 timeline). The camera views get cropped. This makes it impossible to judge the image.