I have looked at the chart of supported markup on the Nokia devices and understand that many do not support emphasis tags. However, it appears that the 5210 is dropping a space character following the </b> tag. The snippet of markup looks like this:

The book <b>BookName</b> covers the topic.

Notice there is a space between the </b> tag and the word "covers". However it renders like this:

The book BookNamecovers the topic.

No space between "BookName" and "covers".

Unsupported markup tags should be ignored, but should not cause undesired behavior as appears to be happening here.
Can someone confirm that this is a bug with the 5210? And propose a workaround?