gnucash: yelp fails to show "yelp ghelp:gnucash-guide"

This issue started showing up since the upreade to yelp 41, identified by openQA: https://openqa.opensuse.org/tests/2061878#step/gnucash/18

I reproduced it outside of openQA, by simply invoking: yelp ghelp:gnucash-guide

I did a few steps inside gdb; yelp_document_get_for_uri comes to doctype YELP_URI_DOCUMENT_TYPE_EXTERNAL, which further down seems not to have any special meaning and just leads to a generic error

(a bit a messy gdb transcript)

yelp_document_get_for_uri (uri=0x5555559a8a80) at libyelp/yelp-document.c:177
177	    gchar *docuri = NULL;
(gdb) 
179	    YelpDocument *document = NULL;
(gdb) 
181	    if (documents == NULL)
(gdb) print document
$12 = 0x0
(gdb) 
$13 = 0x0
(gdb) next
185	    g_return_val_if_fail (yelp_uri_is_resolved (uri), NULL);
(gdb) 
187	    doctype = yelp_uri_get_document_type (uri);
(gdb) 
189	    if (doctype == YELP_URI_DOCUMENT_TYPE_TEXT ||
(gdb) print doctype
$14 = YELP_URI_DOCUMENT_TYPE_EXTERNAL
(gdb) next
190	        doctype == YELP_URI_DOCUMENT_TYPE_HTML ||
(gdb) 
204	    else if (doctype == YELP_URI_DOCUMENT_TYPE_MAN) {
(gdb) 
211	        docuri = yelp_uri_get_document_uri (uri);
(gdb) print docuri
$15 = (gchar *) 0x0
(gdb) next
214	    if (docuri == NULL)
(gdb) print docuri
$16 = (gchar *) 0x555555818c50 "file:///"
(gdb) next
216	    document = g_hash_table_lookup (documents, docuri);
(gdb) 
218	    if (document != NULL) {
(gdb) 
223	    switch (yelp_uri_get_document_type (uri)) {
(gdb) 
247	        break;
(gdb) 
253	    if (document != NULL) {
(gdb) 
258	    g_free (docuri);
(gdb) print docuri
$17 = (gchar *) 0x555555818c50 "file:///"
(gdb) print doctype
$18 = YELP_URI_DOCUMENT_TYPE_EXTERNAL
(gdb) next
259	    return NULL;
(gdb) next
260	}
(gdb) 

Thread 1 "yelp" hit Breakpoint 1, help_cb_uri_resolved (uri=0x5555559a8a80, request=0x555555936060) at libyelp/yelp-view.c:825
825	        doctype = yelp_uri_get_document_type (uri);
(gdb) print doctype
$19 = 32767
(gdb) step
yelp_uri_get_document_type (uri=0x5555559a8a80) at libyelp/yelp-uri.c:427
427	    YelpUriPrivate *priv = yelp_uri_get_instance_private (uri);
(gdb) 
0x00007ffff7fa6166 in yelp_uri_get_instance_private (self=0x0) at libyelp/yelp-uri.c:92
92	G_DEFINE_TYPE_WITH_PRIVATE (YelpUri, yelp_uri, G_TYPE_OBJECT)
(gdb) 
yelp_uri_get_document_type (uri=0x5555559a8a80) at libyelp/yelp-uri.c:428
428	    return priv->doctype;
(gdb) 
429	}
(gdb) 
help_cb_uri_resolved (uri=0x5555559a8a80, request=0x555555936060) at libyelp/yelp-view.c:826
826	        if (doctype == YELP_URI_DOCUMENT_TYPE_NOT_FOUND) {
(gdb) 
838	        } else if (doctype == YELP_URI_DOCUMENT_TYPE_ERROR) {
(gdb) 
846	                                     _("Unknown Error."));