And another one:

Weird end of lines when exporting to PDF
Jorge de Buen, Jul 24, 2023
https://community.adobe.com/t5/indesign-discussions/weird-end-of-lines-when-exporting-to-pdf/td-p/13959664

Regards,
Uwe Laubender
( Adobe Community Expert )

Here another case with a test document that came up in the InDesign forum today:

pdf
sister Photini, Mar 16, 2022
https://community.adobe.com/t5/indesign-discussions/pdf/td-p/12817166

Regards,
Uwe Laubender
( ACP )

This is a critical accessibility issue. If the ONLY solution at this time is to NOT export a tagged, accessible PDF, then how will designers be able to use InDesign to create accessible PDFs, which are required by national laws in most industrialized countries?

amaarora,
if you need a sample document where this happens "reliably", download this zip file from my Dropbox account that is showing the bug in several situations:
HyphenationBug-2021-Package.zip

https://www.dropbox.com/s/1m2c417m3qqmvgc/HyphenationBug-2021-Package.zip?dl=1

Regards,
Uwe Laubender
( ACP )

Hi together,
I still can see this bug with InDesign 2021 version 16.3.0.24 on Windows 10.

The bug is discussed in several threads at the Adobe InDesign Forum. One on-going discussion from today:

Automatic hyphens randomly have letters in them
bracewell4213, Jul 20, 2021
https://community.adobe.com/t5/indesign/automatic-hyphens-randomly-have-letters-in-them/td-p/12189463

I'm rather sure that a bug in the "Adobe World-Ready Composer" is the cause for this.

Same bug is described here:

Random character superimposed on hyphen
Pascal Garin, Jan 29, 2021
https://community.adobe.com/t5/indesign/random-character-superimposed-on-hyphen/td-p/11792704

To Matthias Götze who said: "i have deselected tagged pdf and the bug is also active."
Matthias, please share an InDesign document where you see that issue. Thanks!!

Regards,
Uwe Laubender
( ACP )

i can‘t recommend the bug with a new document.
but if i open my indesign files from indesign 14.x every automatic hyphenation will ignore in the pdf export.

if i convert the automatic hyphenation in a manuell versionat the same place. it would be exported.
with a totally new document the bug didn‘t exists.

i have deselected tagged pdf and the bug is also active.

I am also experiencing this bug, but anywhere in a document exported with the "Create Tagged PDF" export setting turned on, rather than only where there are cross-references. Turning this setting off fixes it, as does inserting a discretionary hyphen at any such break-points.

In March 2020 this issue is stil present in inDesign 15.0.2 (OSX).
I can confirm that the bug can be circumvented by deselecting " Create Tagged PDF" when exporting.