Environment:

Windows 10
InDesign 15.0.3
Acrobat Pro DC 20.0

Steps to reproduce:

1. Create a new Document in InDesign
2. Add a text frame and filler text

3. Export PDF No. 1

4. Add a soft hyphen somewhere in the filler text

5. Export PDF No. 2

6. Compare PDF No. 1 and PDF No. 2 in Acrobat Pro (compare everything, not "text only")

Expected result

Soft hyphen should either be
a) ignored in comparison

or better

b) displayed as one of several commonly used glyphs, e.g. the not-sign "¬"

Observed result

The soft hyphen is displayed as a single space that was added in the comparison, which is totally wrong AND misleading by creating a huge amount of irrelevant changes if numerous soft hyphens are used.