Following up on my above note, it is not an issue. There was syntax change for parameters, so based on the Databricks Runtime version of the compute used, you may need to change how the query does parameters.
Old syntax: ${var1}
New syntax: :var1
Example:

--below works fine with All-purpose compute using version 15.3
SELECT * FROM IDENTIFIER('system.information_schema.'||:var1) LIMIT 1;

--below fails ("unbound parameter") with All-purpose compute using version 14.3
SELECT * FROM IDENTIFIER('system.information_schema.'||:var1) LIMIT 1;

--below succeeds with All-purrpose compute using version 14.3
SELECT * FROM IDENTIFIER('system.information_schema.${var1}') LIMIT 1;