Considering a house but found a gap under the Gate that leads to the backyard

Hello all

First time poster. I’m currently looking at a detached house and found that there is a little gap under the walkway to the backyard. Is this a serious problem? (ie sinking foundation)?

Thank you

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source https://www.reddit.com/r/RealEstate/comments/c7a28p/considering_a_house_but_found_a_gap_under_the/