Found by reading the code while rewriting the docs; not each reproduced.
A push's stale-read check runs after its blobs are uploaded, so a refused stale push leaves orphan blobs and spends uploadBlob quota.
When the PDS refuses a part as too large, every part is uploaded again at half size, including those already accepted.
With KNOTLESS_COMPACT=inline, a compaction error fails the helper after the refs have landed, so git reports a failed push that succeeded. (Fixed in 0.7.0: the helper prints the error and the push succeeds.)
Past the threshold, every push starts a background compaction even when fewer than 2 packs are past the grace period, so most fold nothing. Nothing stops two compactions of one repository running at once.
The gateway's is_sha takes 40-hex only, so SHA-256 repositories can't push through a gateway. (Fixed in 0.7.0: it takes 40 or 64 hex.)
The mirror lock's mtime is never refreshed, so a sync over two minutes can be taken over. (Obsolete: the lock is now an operating-system file lock, with no mtime takeover.)
Gateway createCommit rebuilds up to 8 times with no backoff.
supersedes on a compacted pack is written but never read.
Lexicons: redirect.json has no space property though the code writes one; the pack description says newest-first is push order (it is reverse).
KNOTLESS_INLINE_MAX above 262144 would exceed data's maxLength. (Fixed in 0.7.0: env.rs caps it at the maximum.)
chadtmiller.com/knotless
Found by reading the code while rewriting the docs; not each reproduced.