Buyers mortgage broker advising not to start searches - WWYD?

[Calicopromise]

We accepted an offer on our house at the beginning of June. We’ve found a house, have had our mortgage offer and commenced searches. Our buyers are still in the process of getting their mortgage sorted and their broker is advising them not to start any searches until that’s done.

We are conflicted on what to do. My husband spoke to a friend who is an EA, he said put the house back on the market because they’re making no commitment to buying and if the broker is advising that there’s likely a problem. Until last week we were under the impression that their searches were in process and we were all aiming for completion early September. Any words of wisdom?

Thank you for all the replies. I can understand the reasoning of not starting searches before you’ve got the mortgage offer and can see some posters have said that they have been advised to do that/have done it previously.

We are awaiting an update on where things stand and will make a decision at the end of this week. Seeing the variety of responses here was really helpful and gave my husband and I more opinions to consider, thanks MNetters.