By unintentional design I believe. They've always done this.
Prot Bots will double-bubble henchmen and pets, single bubble their controlling Mastermind and ignore any other players. They will also Repair any other Robotics henchmen.
Bah! 
I heal them (because let's face it, the ProtBots' heals tend to be haphazard to the point of uselessness), buff them, debuff their enemies, and how do they reward me? Half-hearted bubbling, that's how! 
Time to reprogram my bots with a large hammer, I feel...
The healing of protector bots is basicly stupid. Wrong moments, wrong timing or just too late. Luckely /poison got a fast casting healing power so you can do the healing yourself.
Hopefully that will get a minor fix in I7.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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I understood the lack of a 2nd bubble was an unintentional bug and would be fixed. With the vast array of game breaking bugs that exist as well I won't hold my breath for the fix.
Not too bothered about the bubbles since i find them a somewhat useless minor defence for my mm i just hate it when they start casting bubbles on fellow masterminds pets before they finish bubbleing the rest of my minions
Not really bothered about this since I use traps and I have triage beacon and force field generator, I am also planning to get acid mortar. 
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Bah!
I heal them (because let's face it, the ProtBots' heals tend to be haphazard to the point of uselessness), buff them, debuff their enemies, and how do they reward me? Half-hearted bubbling, that's how!
Time to reprogram my bots with a large hammer, I feel...
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Well hey, when both you and your master die and act for cannon fodder for so long, somethings gotta snap pal.
My rob/poison MM's just reached level 24, and is now summoning 2 of her mid-level minions (ProtectorBots for robot MMs).
One of the things these do is bubble the rest of the MM team - the low level battle drones, and the MM herself. Pre-24, when there was only the one ProtBot, each drone got a single bubble, same for the MM, and as the ProtBot couldn't bubble itself that had to do without.
Now there are 2 ProtBots, each of them gets a bubble - they do each other - and each drone now gets 2 bubbles - one from each ProtBot - and the MM still gets a single bubble.
Does anyone know if this is by design, or are my bots just getting a bit of revenge for all those times I left them to be trashed by the EB while dashing for safety myself?