Is the BBC deliberately slighting the SNP?

This tweet, posted yesterday, is entirely fair:
Staggeringly, the BBC failed to include the SNP's list in its summary of who the leaders of the UK's major political parties are.
It was the third-largest party in Westminster in the last parliament.
Why was that? Incompetence? Or deliberate refusal to recognise the right to independence that the SNP asks for?
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