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Assuming this is an issue with decryption, but you could have other issues since you are using an RTL chipset in monitor mode as these are known to be problematic.
Did you see the Gotchas section in the documentation?
Some wireless security mechanisms are decryptable with Wireshark directly, but not all. Assuming you are using one that is straightforward (for example, WPA2-Personal), you will need the 4-way eapol handshake as well as the other items you describe.
Suggestion: start with the wiki page that has a test trace for decryption; this is known to work. Can you decrypt that one?
