I make such a template sensor, if more than 6 lines then Markdown card instead of information shows Unknown
I made the same lines to avoid the error.
- platform: template
sensors:
led_lenti_rgb_color:
friendly_name: "RGB лед лент"
value_template: >
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>
kabinet_dver_wi_fi: R{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[0] }}, G{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[1] }}, B{{ state_attr('light.kabinet_dver_wi_fi', 'rgb_color')[2] }}<br>