Watchlists load is pin-wheeling under MW 1.35.2

Hi Everyone,

We migrated to MW 1.35.2 yesterday. The migration went well and
everything seems to work as expected.

Today I clicked on Watchlists and found the page load is hanging. I've
got the three pulsating circles and some text, but the page does not
finish loading. The text is:

17 pages are on your Watchlist (plus talk pages). Email notification
is enabled. Changes to pages you haven't visited since the changes
occurred are in bold, with solid markers.

There are no Mediawiki errors from PHP. There is nothing in error.log.
The access.log shows this:

x.x.x.x - - [10/Apr/2021:10:37:17 +0000] "GET /wiki/Special:Watchlist
HTTP/1.1" 200 7245
x.x.x.x - - [10/Apr/2021:10:37:17 +0000] "GET
/w/resources/assets/poweredby_mediawiki_132x47.png HTTP/1.1" 304 -
x.x.x.x - - [10/Apr/2021:10:37:17 +0000] "GET
/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector
HTTP/1.1" 200 11895
x.x.x.x - - [10/Apr/2021:10:37:17 +0000] "GET
/w/load.php?lang=en&modules=jquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Csite%7Cjquery.client%2Ccookie%2CmakeCollapsible%7Cjquery.makeCollapsible.styles%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2CjqueryMsg%2Clanguage%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.rcfilters.filters.dm%2Cui%7Cmediawiki.special.changeslist.legend.js%7Cmediawiki.special.recentchanges%2Cwatchlist%7Cmediawiki.widgets.styles%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-editing-core%2Cicons-editing-styling%2Cicons-interactions%2Cicons-layout%2Cicons-media%2Cicons-moderation%2Cindicators%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=1y7vj
HTTP/1.1" 304 -

Any thoughts on how to finish load the Watchlist page?

Jeff

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