Sounds like due to how the ZBMINI-L is designed as no-neutral hardware switches to work it needs to leak/passthrough some electrical current just to operate but that will not work if the bulb does not also leak/passthrough enough electrical current (to keep the light on for the ZBMINI-L itself so to speak). My guess is that you will not be able to use any “no-neutral” hardware switches in-line with any smart lightbulbs that way, but suggest anyway that you ask here → https://community.home-assistant.io/t/sonoff-zbmini-l-zigbee-3-0-smart-switch-by-itead-works-without-neutral-wire-and-based-on-cc2652p-so-could-maybe-also-work-as-a-zigbee-router/384644 If that is the case then your only option is to feed power to the ZBMINI-L separately so they are not connected in series after each other as that will break electrical power for one of them
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