After the VLAN is deleted, the access ports that belong to that VLAN move into the inactive state until the ports are moved to another VLAN. As a security measure, ports in the inactive state do not forward traffic. Example: I created a VLAN 9 and assigned a port F1/4 to it. Then I deleted the VLAN and observed that the port F1/4 went to an inactive state as shown below:

Then I created VLAN again from VLAN database mode and observed that the port again became active as shown below:

So, we must take care of the access ports of a particular VLAN before deleting that VLAN.