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Parent with child containing particle emitter can't be moved on frame 1 keyframe
Confirmed, NormalPublic

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-27 14:01, hash: rBa9e7d503ddcd

Short description of error
Empty in provided .blend file cannot be moved on frame 1 when it has a keyframe on frame 1. It can be moved on any other frame with or without a keyframe on that frame, or on frame 1 if it doesn't have a keyframe.

Exact steps for others to reproduce the error
Select the Empty in the provided .blend file, and attempt to move it with g, transform sliders, etc. It will not move.

I'm not sure how I got my .blend file in this state, as my best effort at making a seemingly identical set of objects does not reproduce it. I'm guessing someone will have to inspect the internal state of these objects to find something amiss.

Event Timeline

Falk David (filedescriptor) changed the task status from Needs Triage to Confirmed.Mon, Mar 29, 10:22 AM

I can confirm this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-03-29 07:25, hash: rBb9734f7716f6. The cause seems to be that the empty has a child object which is an emitter. Deleting the physics modifier will resolve the problem.