UTF-8 without signature recognised as Vietnamese

[Patrick C]

[1] ‘Bug’ like behaviour
[2] Question on forcing EmEditor to always open as UTF-8

[1] ‘Bug’ like behaviour
Given a UTF-8 text file

file encoding: UTF-8 without signature (i.e. no BOM)
when it contains the four letters     ‘stb    it is correctly recognised :)

but the almost identical UTF-8 text file (sta instead of stb) is recognised as Vietnamese !?

file encoding: UTF-8 without signature (i.e. no BOM)
when it contains the four letters     ‘sta    it is recognised as Vietnamese !!??

[2] Question on forcing EmEditor to always open as UTF-8
Is there an EmEditor setting that would open the above example as UTF-8 (even if that were incorrect)?
All my attempts failed.

PS EmEditor Pro 64bit Version 21.6.1

[Patrick C]

figured out a ‘solution’ for [2] :
Tools → Properties for all Configurations → File → untick “Detect all”

[1] might still be of interest for Yutaka

[Yutaka Emura]

1. This is not a bug, but any file encoding detection could fail. I would recommend not using the Detect All option.

2. To open files always as UTF-8, please deselect the Detect All option, and select UTF-8 as Opening Encoding in the File page of configuration properties.

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