A modified version of this patch was commited upstream
as part of a fixup series
https://bugzilla.netfilter.org/show_bug.cgi?id=1593
https://git.netfilter.org/iptables/commit/?id=0836524f093c0fd9c39604a46a949e43d9b47ef2

--- a/iptables/xtables-monitor.c
+++ b/iptables/xtables-monitor.c
@@ -629,6 +629,8 @@ int xtables_monitor_main(int argc, char
 	init_extensions();
 	init_extensions4();
 	init_extensions6();
+	init_extensionsa();
+	init_extensionsb();
 #endif
 
 	if (nft_init(&h, AF_INET, xtables_ipv4)) {
--- a/iptables/xtables-restore.c
+++ b/iptables/xtables-restore.c
@@ -368,9 +368,17 @@ xtables_restore_main(int family, const c
 #endif
 		break;
 	case NFPROTO_ARP:
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsa();
+#endif
 		tables = xtables_arp;
 		break;
 	case NFPROTO_BRIDGE:
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsb();
+#endif
 		tables = xtables_bridge;
 		break;
 	default:
--- a/iptables/xtables-save.c
+++ b/iptables/xtables-save.c
@@ -208,9 +208,17 @@ xtables_save_main(int family, int argc,
 		d.commit = true;
 		break;
 	case NFPROTO_ARP:
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsa();
+#endif
 		tables = xtables_arp;
 		break;
 	case NFPROTO_BRIDGE: {
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsb();
+#endif
 		const char *ctr = getenv("EBTABLES_SAVE_COUNTER");
 
 		if (!(d.format & FMT_NOCOUNTS)) {
--- a/iptables/xtables-standalone.c
+++ b/iptables/xtables-standalone.c
@@ -58,6 +58,8 @@ xtables_main(int family, const char *pro
 	init_extensions();
 	init_extensions4();
 	init_extensions6();
+	init_extensionsa();
+	init_extensionsb();
 #endif
 
 	if (nft_init(&h, family, xtables_ipv4) < 0) {
--- a/iptables/xtables-translate.c
+++ b/iptables/xtables-translate.c
@@ -474,9 +474,17 @@ static int xtables_xlate_main_common(str
 		tables = xtables_ipv4;
 		break;
 	case NFPROTO_ARP:
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsa();
+#endif
 		tables = xtables_arp;
 		break;
 	case NFPROTO_BRIDGE:
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+		init_extensions();
+		init_extensionsb();
+#endif
 		tables = xtables_bridge;
 		break;
 	default:
--- a/iptables/xtables-arp.c
+++ b/iptables/xtables-arp.c
@@ -438,6 +438,7 @@ int nft_init_arp(struct nft_handle *h, c
 	}
 
 #if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+	init_extensions();
 	init_extensionsa();
 #endif
 
--- a/iptables/xtables-eb.c
+++ b/iptables/xtables-eb.c
@@ -685,6 +685,7 @@ int nft_init_eb(struct nft_handle *h, co
 	}
 
 #if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+	init_extensions();
 	init_extensionsb();
 #endif