The Compose file for the fi_FI.UTF-8 locale at /usr/share/X11/locale/fi_FI.UTF-8/Compose contains the following lines: <dead_acute> <dead_circumflex> <E> : "Ệ" U1EC6 # LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND ACUTE <dead_belowdot> <dead_circumflex> <E> : "Ệ" U1EC6 # LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND DOT BELOW Thus the codepoint "Ệ" U1EC6 is produced with two different sequences. Based on the key sequences and the comments at the ends of the lines, it is clear that the first line is a mistake. Instead of "Ệ" U1EC6, the line should read "Ế" U1EBE, a character which cannot be produced with the current Compose file otherwise at all. This bug was first reported on Launchpad at: https://bugs.launchpad.net/ubuntu/+source/libx11/+bug/1772537
Thank you for reporting the issue, the standard SFS 5966 from where this issue originates from is being updated, I'll ask to include this fix in the new revision as well and later on submit an update for the fi_FI Compose file to match the updated standard, also including a fix for this. Thanks.
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