I decided to take the plastic bags off my pear grafts since it's been getting so hot I was afraid the scionwood would cook.  The beeswax has done a remarkably good job of staying put...except for on top of one of the four pieces of scionwood.  I thought I might have just missed that spot when initially dabbing on the wax, but photographic evidence is to the contrary.

There's quite a difference in vibrancy between the scionwood that lost its cap and the one that retained its cap.  The former looks a bit shriveled up and the bud appears to have tried to open and failed, while the wax-capped twig looks plumper and content to wait until the rest of the tree starts leafing out.

Hopefully one piece of scionwood will be enough to change the variety on that pear.  I don't expect to see any growth for a month or two since grafted scionwood often waits to wake up until after the rootstock has already put out leaves.  Stay tuned for further updates.