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Previous segment not captured means exactly that, a segment in the tcp stream has not been captured, this is determined by the tcp sequence numbers. Common at the start of a capture if the initial connection occurred prior to the capture, can also happen if the capturing host dropped a packet, or if there was actual packet loss.
The Ignored Unknown Record occurs because the TLS dissector doesn't understand the data. This might, in your case, be due to tcp segment loss.
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