Do you have a resource explaining what property changes are and maybe even what they are good for?
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Properties in general:
http://svnbook.red-bean.com/en/1.5/svn.advanced.props.html

But the most important is svn:mergeinfo property:
http://svnbook.red-bean.com/en/1.5/svn.branchmerge.basicmerging.html#svn.branchmerge.basicmerging.mergeinfo
With this you see that a commit was actually a merged revision. Btw. if you view branch (any directory in fact) in repository browser it should show mergeinfo property so you could know which revisions are merged to that branch.

For example this is very well made in Trac http://trac.edgewall.org/ repository browser. Simply example here:
http://trac.edgewall.org/browser/branches/0.11-stable

U can see there right now "svn:mergeinfo set to" and bottom are listed branches with merged and eligible info. If you move mouse over them you can see which revisions are merged and which are missing.
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I have a similar usability issue with Subversion property changes. The property change that I have to use sometimes is to change the commit message after a version has been committed, because I have apps going up on the iTunes app store and I don't know whether the version is the version that was accepted for sale until 5 days after it was committed, which means that I need to change the commit message from something along the lines of "submitted 1.1 version" to "accepted 1.1 version" in order to make good use of having a versioning system. When I make a property change to a revision with an existing commit message in the following way:

svnadmin setlog local/path/to/repository -r 999 file.txt --bypass-hooks

The commit message is updated in svn, which can be verified by running:

svn -r 999 log

inside of the working copy, but the commit message is never updated in the repository tab of Redmine, even if I reboot and even if I attempt to run fetch_changesets (which always fails with an error). I hope there is a workaround for this since seeing the new commit message is actually pretty important for avoiding regressions. Thanks!
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I agree, svn properties are very important - and should get shown in revisions as well as the regular repository browser. We use svn-externals a lot (which are also set as svn-properties), there's currently no way to view them in Redmine.

@Halle Winkler: As far as I know, commits and their messages are cached by Redmine (tables "changes" and "changesets" e.g.). The only way might be to delete some lines in the respective database tables - but I don't think that's a good idea...
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+1 +1 +1
Would be really useful to see the property changes as well.
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+1. It is a standard (and very comfortable) feature on Trac.
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+1
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+1
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+1 (this missing feature still prevents us from dropping trac's svn web view)
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Is there any update on when this might be implemented.
I'm using

<pre>
Environment:
Redmine version 4.0.2.stable
Ruby version 2.5.5-p157 (2019-03-15) [x86_64-linux]
Rails version 5.2.2
Environment production
Database adapter Mysql2
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
SCM:
Subversion 1.12.0
Cvs 1.12.13
Git 2.19.1
Filesystem
</pre>
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duplicates,Closed,6877,Add prop (property) changes to revision diffs
duplicates,Closed,6876,Diff view truncating lines shouldn't be counting SVN props