Revert "Revert "Update all instances of [slide]
placeholder syntax""
#39960
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Reverts #39959, restoring #39834
The original PR introduced a bunch of JSON errors because I completely forgot to escape the
"
in the new syntax. I thought I had tested that by re-seeding locally, but apparently that didn't work since obviously it didn't catch the error. In addition to correctly escaping that syntax in this PR, I'm also going to attempt to figure out why my tests didn't work.