A read that finds a variant in memory but cannot open its file removes
it from memory. When that happens after StoreVariant has added the
variant's content type, a read that opened the variant file before the
store wrote its .meta file finds memory empty and keeps
application/octet-stream there, so every later hit serves the image
with it. The test runs the store, the failed read and the read without
a .meta file in that order, then checks a later hit. It fails now.
Model: opus-5-5
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