Here are the issues I had, and how I fixed them:
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Tags were no longer being displayed in article layout. Usually tags would be listed at the end of the article, but they disappeared after updating to Joomla 4.2.4.
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The modified date was no longer being displayed under the article title, it was being displayed after the article body. Usually the modified data (article info) would be listed immediately under the article title, but it disappeared after updating to Joomla 4.2.4.
The solution was simple (but unexpected):
In each article, go to the Options tab, and in the Layouts section I had to change the "Position of Article Info" setting to "Above" (even if Global is also set to above). This made the Tags appear at the bottom of the article again. It also made the article info appear under the title again (as long as you have something like modified date set to "show" in article options).
Hope that helps anyone finding this thread and having the same issue...