This issue is not present in 4.25.4

You can also avoid the problem if the LoopBehavior of the EmitterState is Multiple and LoopDelay is enabled.

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It seems to be a binding of certain parameters and you can work around it by editing the module of the EmitterState as follows.
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Steps to Reproduce

1. Create a fountain emitter.
2. View the timeline.

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ComponentUE - Niagara
Affects Versions4.26.1
Target Fix4.27
Fix Commit16158745
Main Commit16199288
Release Commit16158745
CreatedMar 4, 2021
ResolvedMay 4, 2021
UpdatedNov 30, 2022