PHP 7.3: Use of undefined constant CACHE_LIFETIME...

Since upgrading to 8.5.1 I get errors at different places, stating the following:
Whoops \ Exception \ ErrorException (E_WARNING)
Use of undefined constant CACHE_LIFETIME - assumed 'CACHE_LIFETIME' (this will throw an Error in a future version of PHP)

If I set PHP 7.1 on, it's all working, with PHP 7.3 it fails. I get it when clicking "edit" on the frontend in a normal content page, or also when trying to build the sitemap or re-indexing the sitemap in the automated jobs.

Is that a known bug? Is 8.5.1 not compatible with PHP 7.3 yet?

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Kiesel replied on at Permalink Best Answer Reply
Fixed it. Found an old block using this constant, removed it, and everything works now.
haundavid replied on at Permalink Reply
I see this is about a year ago. Can you explain the steps you took to find the issues and remove the block? Did you remove a theme block within the theme file, a sitewide block in C5?
Kiesel replied on at Permalink Reply
I think I just did a search trough all the blocks looking for "CACHE_LIFETIME".

You probably also could try on a new page to bind in each block at a time and when this error pops up by one block you know it's the problematic one.

I'm not sure anymore if I just de-installed the blocks in the backend under blocks or just removed the CACHE_LIFETIME entry. Like just delete that line should get the error to disappear.