Capture inbound packets only

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What operating system?
On linux (YMMV), you could use inbound or outbound as a capture filter:
pcap-filter.7 man page

Open issue to implement in npcap on Windows:
248: Support pcap_setdirection() for filtering packets by direction (sent or received)

Note that the "filtering" in "Support pcap_setdirection() for filtering packets by direction (sent or received)" is not filtering with a capture filter expression, it's filtering in a program that explicitly calls pcap_setdirection(), which tcpdump does (that's how -Q is implemented), but Wireshark does not.

inbound "compiles" on Ubuntu with Wireshark 3.5.0rc0. Is that a bug?

(000) ldh      [-4092]
(001) jeq      #0x4             jt 2    jf 3
(002) ret      #0
(003) ret      #262144

inbound "compiles" on Ubuntu with Wireshark 3.5.0rc0. Is that a bug?

No. As @Chuckc said, "On linux (YMMV), you could use inbound or outbound as a capture filter:"