When you disable TDEngine, you will be presented with Start Request (as evidenced by Too Quickly for Taosd.service)

The solution
Edit taosd.service and look at the prompts. Line 3 of the image above. Loaded: Loaded follows

vim /etc/systemd/system/taosd.service

Modify StartLimitBurst = 0

[Unit]
Description=TDengine server service
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/bin/taosd
ExecStartPre=/usr/local/taos/bin/startPre.sh
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
StandardOutput=null
Restart=always
StartLimitBurst=0
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

Launch OK again