Here is what I started to get in recent build (RC4) of 21.02 (AMD Geode + ath9k). Don't remember anything similar on 19.07.
[38773.208602] ------------[ cut here ]------------
[38773.213298] WARNING: CPU: 0 PID: 0 at 0xd0b5e6c0 [mac80211@23a5175c+0x6b000]
[38773.220374] Modules linked in: ath9k ath9k_common xt_connlimit pppoe ppp_async nf_conncount iptable_nat ath9k_hw ath xt_state xt_nat xt_helper xt_conntrack xt_connmark xt_connbytes xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD xt_CT pppox ppp_generic nf_nat_tftp nf_nat_snmp_basic nf_nat_sip nf_nat_pptp nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda nf_nat nf_flow_table_hw nf_flow_table nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_sip nf_conntrack_pptp nf_conntrack_netlink nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nf_conntrack_broadcast nf_conntrack_amanda nf_conntrack mac80211 ipt_REJECT cfg80211 xt_time xt_tcpudp xt_tcpmss xt_statistic xt_recent xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_ecn xt_dscp xt_comment xt_TCPMSS xt_LOG xt_HL xt_DSCP xt_CLASSIFY ts_kmp ts_fsm ts_bm slhc sch_cake nf_reject_ipv4 nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 iptable_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat asn1_decoder sch_tbf sch_ingress sch_htb sch_hfsc
[38773.220673] em_u32 cls_u32 cls_tcindex cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred act_gact ledtrig_gpio xt_set ip_set_list_set ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb vfat fat nls_utf8 nls_iso8859_1 nls_cp437 geode_aes cbc button_hotplug aead cryptomgr crypto_null
[38773.365377] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.137 #0
[38773.371251] EIP: 0xd0b5e6c0 [mac80211@23a5175c+0x6b000]
[38773.376508] Code: 59 5b e9 7a fc ff ff 8d 76 00 83 ce 04 83 e1 1f 89 f0 c1 e0 05 09 c1 89 f0 66 c1 e8 03 88 4a 01 88 42 02 e9 a6 fd ff ff 66 90 <0f> 0b c6 02 ff 39 7d 0c 0f 8f 27 ff ff ff e9 dd fd ff ff 8d 74 26
[38773.395325] EAX: cda30130 EBX: cc30df00 ECX: 00000038 EDX: cda38998
[38773.401626] ESI: 000000c8 EDI: 00000001 EBP: cf813e6c ESP: cf813e18
[38773.407927] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 EFLAGS: 00210212
[38773.414745] CR0: 80050033 CR2: b7ef4000 CR3: 0d6f3000 CR4: 00000090
[38773.421039] Call Trace:
[38773.423513] <SOFTIRQ>
[38773.425917] ? 0xd0bf2237 [ath9k@671f56ed+0x17000]
[38773.430745] 0xd0bf4869 [ath9k@671f56ed+0x17000]
[38773.435401] 0xd0bed914 [ath9k@671f56ed+0x17000]
[38773.440051] ? 0xd0bed890 [ath9k@671f56ed+0x17000]
[38773.444876] 0xd0b6dcb2 [mac80211@23a5175c+0x6b000]
[38773.449792] 0xd0b6ddb5 [mac80211@23a5175c+0x6b000]
[38773.454705] 0xd0b7442f [mac80211@23a5175c+0x6b000]
[38773.459620] 0xd0b75b48 [mac80211@23a5175c+0x6b000]
[38773.464530] ? 0xd0bedf84 [ath9k@671f56ed+0x17000]
[38773.469351] 0xc1042e9a
[38773.471823] 0xc1042f02
[38773.474292] 0xc1577eba
[38773.476764] ? 0xc1577e20
[38773.479414] 0xc1017540
[38773.481889] </SOFTIRQ>
[38773.484361] ? 0xc1043035
[38773.487003] ? 0xc1577b2b
[38773.489647] ? 0xc1576cc2
[38773.492291] ? 0xc157007b
[38773.494933] ? 0xc157007b
[38773.497575] ? 0xc1575d25
[38773.500219] ? 0xc1575d25
[38773.502862] ? 0xc101c1cd
[38773.505505] ? 0xc1575ead
[38773.508147] ? 0xc105df55
[38773.510790] ? 0xc105e0c5
[38773.513433] ? 0xc1571c5b
[38773.516077] ? 0xc16d475c
[38773.518719] ? 0xc16d4b4c
[38773.521364] ? 0xc16d422b
[38773.524014] ? 0xc10001e4
[38773.526661] ---[ end trace 58ef53243fa5f45f ]---