Hello Vlad and z64! (wow, you guys are fast – do you guys ever rest? 🙃)
Ok, so I did another test, this time in Safari, and the results are a bit perplexing: at first the shopping results did appear, but after I switched between Verbatim and All Results a few times the “No matches” screen appeared. Here is a screen recording so you can see this.
I also noticed another bug: after toggling the Verbatim/All Results options a few times, its label doesn't match the selected option (the label says Verbatim even though the All Results option is selected). This is clearly visible at the end of the video linked above. (I previously reported a similar bug here.